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常用塑膠材料簡介.TXT

'常用塑膠材料簡介.TXT'
?常用塑膠材料簡介.TXT* commonly used (thermoplastic) plastics are mainly in the following types:Polystyrene (PS) and modified polystyrene (HIPS) etcPropylene-butadiene styrene polymer (ABS)Formaldehyde (POM)Polyethylene (PE)Polypropylene (PP)PVC (PVC)Polycarbonate (PC)Ptolamine (PA)Polymethyl methacrylate (PMMA)* the performanee of plastic and the design of the beer is as follows:One. Polystyrene (PS) and modified polystyrene (HIPS) etcPolystyrene (PS or GPPS), commonly known as "hard glue,z, is non-crystalline plastic and its main properties are as follows:Transparency, good gloss, easy coloring.Soluble in organic solvents (acetone, trichloroethylene, etc?), which can be used to spray oil.The forming shrinkage rate is small (about 0.4%), and the dimensional stability is good?The surface is easy to clean and the plastic parts are high?Acid resistance, acid, alcohol, oil ester easy stress cracking.The main properties of modified polystyrene (HIPS), which is called ''non-breaking glue", are as follows:A moderate amount (5-20%) of butadiene rubber was added to the GPSS, which improved the impact resistance of hard glue?Colour: opaque or slightly yellow?3. The HIPS and GPPS according to the need can be mixed plastic beer, GPPS ingredients more products shine, the better, the better the performance of the f1ow? For example: components than the HIPS, GPPS 二 7:3 or speak, can keep the enough strength and good quality of apparent?Other main prope-省略部分-, avoid the absorption of moisture? 3. A poor liquidity, appropriate high pressure molding, injection pressure: 80-100 mpa, the holding pressure is about 80% of injection pressure, back pressure also shoulds not be too high. To prevent the early cooling of gate runner, appropriate longer injection time, need enough pressure feeding.4. The injection speedThe speed of injection is very important to viscosity, not too fast.5. Material temperatureIt increases with the temperature of the tube, but the temperature should not be too high if it can be filled with the cavity, so as to reduce the discoloration and the defects such as silver wire?Temperature parameters, feed tube before 200-230 °C, in 215-235 °C, feed tube after 140-160 °C.6. Mould temperature is high, the product transparency high, and reduce the bad fusion, especially can reduce internal stress of products, and easy mold, mold temperature is 70-90 °C in genera1.The design of mould should be simple, smooth, and with a wide gate ?8. Reduce internal stress? Heat treatment temperature of 70-80 °C (heat or hot water I slow cooling, processing time depending on the product wall thickness, average of 4 hours?)Reduce the black spot:(1)(2) . Clean molds (regularly)(3) . machine table cleaning (front, screw, nozzle etc)The surface is clean, chrome-plated anticorrosion. To prevent the product transparency, color, do not use the remover, but should increase the die incline, convenient to remove the mold?
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